header {
  display: flex;
  line-height: 50px;
}

header span {
  color: red;
  font-weight: bold;
  font-size: 30px;
  border: 2px solid cadetblue;
}

header input {
  flex-grow: 1;
  height: 50px;
  border: 2px solid cadetblue;
  font-size: 30px;
}

header button {
  background-color: red;
  color: #fff;
  border: 2px solid cadetblue;
}

main section {
  height: 50px;
  display: flex;
  border: 2px solid cadetblue;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  margin-top: 20px;
}

.empty {
  padding: 100px 0;
  text-align: center;
  font-size: 20px;
}

.loading {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0, 0, 0, .3);
  /*display: flex;*/
  display: none;
  align-items: center;
  justify-content: center;
}

.loading span {
  width: 100px;
  height: 100px;
  /*background-color: cadetblue;*/
  animation: loading 2s infinite linear;
}

@keyframes loading {
  to {
    transform: rotate(360deg);
  }
}
